Typewriting machine with power drive



March 30 ,1926.

- C. scHLUNs TYPEWRITING MACHINE WITH rowan DRIVE Filed July 28 Inventor) "i2 ELI mmn l n n n fiul lar ll 1 I I March 30 1926.

C. SCHLUNS I TYPEWRITING MACHINE WITH POWER DRIVE Filed July 28, I923 4 Sheets Sheet 2 March 30 1926. 1,579,151

c. SCHLUNS I TYPEWRITING MACHINE WITH POWER muvz Filed July 28, 1923 4 Sheets-Sheet 3 March 30 1926. 1,579,151

c. scHLUNs TYPEWRITING MACHINE WITH POWER DRIVE Filed July 28 1923 4 ShBEtS-Sht 4 Fig. 7.

Patented Mar. 30, 1926.

UNITED STATES 1,579,151 PATENT OFFICE.

GAB-L SCHL'U'NS, OF BERLIN-STEGLITZ, GERMANY, ASSIGNOR TO MERCEDES BU'RO- IASOHINEN- UND WAFFEN-WERKE, OF BENSHAUSEN, THURINGIA, POST MEHLIS,

GERMANY. v

TYPEWRITING INIAOHINE WITH POWER DRIVE.

Application filed July 28, 1923. Serial No. 654,446,

To all whom it may concern.

Be it known that I, CARL SoHLiiNs, a citizen of Germany, residing at Berlin- Steglitz, Germany, have invented certain 6 new and useful Improvements in Typewriting Machines with Power Drive (for' which I have filed applications in Germany Aug. 31, 1920; Nov. 26, 1921; Feb. 20, 1922; Apr. 25, 1922; May 11,1922; June 20, 1922; July 19, 1922), of which the following is a specification.

This invention relates to a type-writing machine with power drive.

According to this invention the element which, at the depression of a key lever, produ'ces the coupling between the mechanically driven cam shaft and the type lever is elastically constructed in such a manner that. even if the coupling member strikes against a cam or against any other obstacle, the keys may be moved without impediment into the end-position. The key levers may further have elastic locking levers adjustable in longitudinal direction and designed to engage between the locking elements at the depressing of the key level. These locking levers may elastically engage during the locking process with a stop prevent.- ing the longitudinal displacement of the locking levers. A pulling or pressing element serves preferably for releasing said locking levers, the element being operated by the type-lever which drops back, said locking lever being thus oscillated perpendicularly to its longitudinal direction. so that it is brought. owing to its elasticity, automatically and independently of the key lever into the position of rest. a

A further feature of the invention is an improved device for adjusting either singly or in common the type levers, as regards their striking force, in-a machine equipped with the above described type lever actuation. In order 'to regulate the striking 0 force of each type lever adjusting members are coupled by a common adjusting element in such a manner that they are adjusted all at the same time whereby it is possible to tions of service. In thls manner it is posadapt the machine to the prevailing condi-' the striking force of each single type lever in case of a type being prematurely worn. A transverse beam arranged under the coupling elements may for instance carry adjusting elements which permit the adjusting of the several types, or the adjusting elements which are independent per so may be releasably mounted by locking members. These locking members are preferably arranged in such a manner that each individual adjusting element may be released individually, the locking of all the other'elements being preserved. Two rods inserted from opposite sides into rows of holes arranged on an arc concentric to the pivot axle of the adjusting elements may serve as locking elements. The centering is preferably regulated by a transmission member, controlled by a lever. so.

that a Very accurate adjusting is possible.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part of this specification, witlrthe understanding that While on the drawings one embodiment of the invention is disclosed, the invention is not confined to any strict. conformity with the showing of the drawings, but may be embodied in any manner which does not make a material departure from the salient features of the invention.

In the drawings Fig. 1 shows in perspective front elevation a type-writing machine in which the machine proper is shown in elevation and the power coupling in section.

Fig. 2 is. a plan View of Fig. 1..

Fig. 3 is a cross section on line A-B of Fig. 1.

Fig. 4 shows on enlarged scale constructional details of the part shown in Fig.

Fig. 5 shows the key-locking mechanism in elevation.

Fig. 6 is a section through the lockinglever, locking-element and the locking bar as shown in Fig, 5.

Fig. 7 is a face view, in an enlarged scale, of the mechanism serving for the common adjustment of the type levers, and Fig. 8 shows in enlarged scale, a top plan view of the individual adjusting members in the position in which one of the members for the purpose of adjustment is released from the others. For the sake of clearness the bar serving forthe common adjustment has been omitted.

\Vith the key lover I (Fig. 3) the latch 4 is movably connected as its vertical slot 3 engages over the stud 2 laterally projecting from the key lever. The latch r is maintained in its position by the springs 5, a stud being provided for determining the position of rest of said latch. The nose 6 of latch 4 grips over the projection T of the pull hook 8. If the key lever 1 is being .depressed it'pulls through the intermediary of the latch 4.the pull hook 8 down so that the nose 9 at the-end ofthis pull hook comes into the range of the cams 10 (Fig 4.) of the driving shaft 11 which is journalled in the walls 12 of the type cage and driven by a motor M whose rotation is transmitted thereto by a worm drive S permanently rotated in the direction of the arrow (Figs. 3 and 4), whereby the striking of the type lever 23 is produced in the well known manner. If at the depression of the key lever 1 a cam 10 should stand just under the nose 9 the de scending of the key may nevertheless continue owing to the tact that the latch 4 is spring controlled and adaptedto move in vertical direction, so that shocks at the depression of the key levers 1 are avoided.

On the inner surface of the side walls 12 of the cage (Figs. 1, 3, 7 and 8) levers 14 are pivotally arranged each on a screw bolt 13'. 'lhes'elevers are rigidly connected with one another by means of an axle 15 situated under the pull levers, so that the levers and the axle form a bridge. Around the axle 15 adjusting elements are pivotally arranged which are preferably each composed of two separate parts 16, 17 secured in determined position with regard to one another. In accordance with the intervals, the strength, and the number of the adjusting elements a bar 18 parallel to the axle 15 and tixed between the ends of the lever 14 is a rranged which has cross slits. The adjusting disks 16 of the adjusting elements have holes 15) arranged on an are concentric to the axle 15. Two adjusting pins 21 are inserted through longitudinal slits 20 of the bar and through holes 19 of all adjusting disks 16. The longitudinal slits 20 are preferably covered by a sheet metal hood 22 in order to ensure abetter guiding of the adjusting pins, the bent flaps 23 serving for the centering of said hood. The flaps 23 have guide pins 24:

engaging with oblique guide slots 25 of the bar 26 for the centering (Figs 1 and 7). The guide pins 27 riveted on'this barmove 1n the slots 28 of the angle irons 29 fixed on W the side walls 12 of the cage and serve for justing lever 34 pivotally mounted on the axle 33 (Figs. 1, 3, and 7).

The operation of this device is as follows By depression of the key lever 1 the pull hook 8 is brought into the range of the driving shaft 11 which rotates in the direction of the arrow, and it'comes in engagement with said shaft whereby the type lever is operated. The striking force corresponds with the depth for which the pull hook engages with the camshaft.- and with the consequent duration of this engagement. The depth of the engagen'lent and the duration of the same are regulated by the adjusting mechanism in the following manner At the first adjusting one of the adjusting pins is inserted after the adjusting disks 16 have been brought to the corresponding position with the aid of a small adjusting hook. The duration of the engagen'ient of the pull hook 8 is shortened or lengthened by oscillating the adjusting disks upwardly or downwardly and by securing the same in position by inserting the adjusting needle, the striking force being thus weakened or strengthened as the eccentric 17 is fixed on the adjusting disk 16. All the types successively from right to left or from left to right may be thus uniformly adjusted as regards their printing force. ished the second adjusting needle is inserted from the opposite direction to the first. one, this second adjusting pin being unnecessary for the successive adjusting of the pull hooks but necessary it' an indiridual pull hook has to be adjusted owing to being prei'naturely worn. By partly pulling out the two adjusting pins the adjusting element to be adjusted is released, but all the other adjusting element's reu'iain secured in their positions. After the adjusting of the individual pull hook the adjusting needles are com-- pletely reinserted so that this adjusting element is also secured in its position.

The typist has with this arrangement the ability to raise or to lower the entire adjusting mechanism through the intermediary of the bar 26 in oscillating the same around the pivot 13, the lever 34: having to he turned for this purpose to the left or to the right whereby the striking force of all the types is uni ormly increased or weakened. If therefore the lever 34 is brought into the position designated as 1 it is evident. that .bar'26 will be moved to the right so \Vhen the adjusting is tin-' that the oblique slots 25 will press the pins 2 1 and therewith the bar 18 downwardly so that the lever 8 will remain longer in engagement with the teeth 10 of the shaft 11 thereby giving a stronger stroke to all the a medium stroke of the type levers is secured, while by placing the lever 34 in the position 111 a weaker stroke of the type levers results.

For limiting the movement of the pull hooks S in upward direction and for securing the correct engaging of the noses 6 of the levers 4: with the noses 7 of the pull hooks 8 an eccentrically adjustable axle l5 (Fig. 3) is arranged between the side walls of'the cage.

In order to prevent the simultaneous depression of two key levers a key locking mechanism is arranged which consists essentially or rollers 49 (Fig. 3) loosely located in a guide groove 50. Wedges 51 are arranged on the key levers 1. The total interval between the rollers 49 is calculated so that it is less than the cross section of a wedge 51. The wedge 51 can therefore be inserted be tween the rollers 49, only so far that the wedge-faces are still tangent to the-rollers.

The wedge 51 engaging between the rollers displaces all the rollers-to the right and to the left respectively so that all the rollers are incontact without any interval, the en gaging of the pull hook 8 with the cam shaft 11 being thus made possible. If after the depression of a key lever a second key lever is depressed this second key lever cannot reach the working position.

.The secure locking of the key levers in avoiding any clamping action, which is otherwise caused by the wedges 51, is especially important for mechanically driven type writing machines.

Figs. 5 and 6 show a form of construction of a key locking mechanism in which at the depression of one keylever 1 thelocking lever 55 corresponding to latch 4 in Fig. 3

is brought, through the action of a spring 56. between two adjacent rollers 57 said rollers moving away from one another for a distance which is equal to the thickness of the lever, all other rollers being pressed together without interval so that no other locking lever 55 can penetrate between the same until the first locking lever has been Withdrawn.

As the spring 56 tends to oscillate the locking lever 55 around the bolt 58in clockwise direction the nose 59 engages in this position with the groove GO'of the locking rail or keeper (i1 and prevents a collision between two type levers ata premature releasing of the depressed key lever with regard to the lever to be depressed anew. If a depressed kev lever is prematurely released, the nose ot' the locking lever 55 will retain thislocking lever and the key lever 1 in the lower position. A second key lever may however be depressed already, but the type lever of this key could execute its movement only after the first type lever returning to its position of rest has made its locking lever oscillate for instance by means of the pull hook 63, so that it gets out from between the locking rollers. The locking lever 55 brings, at its descending movement, the corresponding pull book 63 into the range of the cam shaft (ii.

The rotating shaft 64 draws the pull hook (53 along until the stripping rail disengages the same from the shaft (3% whereupon said hook is brought into the position of rest by the action of a spring 66. liefore the pull hook 63 comes in contact with the rail (35, the hook 67 of the locking lever has been released owing to the movement in lon gitudinal direction of the pull lever 63.

\Vhen the pull lever 63 is returned to the position of rest the small hook 8 of the pull hook 63 presses back the nose 69 of the locking lever 55 whereby the nose 59 of this locking lever is made to disengage from groove 60. This disengaging takes there-- fore place as soon as the type lever has reached again its position of rest.

The key lever 1 is brought toits position of rest by the action of spring 70. The locking lever 55 jumps back under the hook 68 of the pull hook 63 under the action of the spring 56.

' I claim 1. In a typewriter, type levers. a rotating drive shaft, means connected with said type levers for operating the latter, means for bringing said operating means into engagement with said drive shaft for actuating said type levers, independently rotatable abutment cams for limiting the engagement of said operating means with said drive shaft, and means for locking said cams in selective positions.

2. In a typewriter, type levers,a rotating drive shaft, operating means connected to said type levers, means for engaging said operating means with said drive shaft, a transverse member beneath aid operating means, means for raising and lowering Said member .for limiting the engagementof said operating means with said drive shaft, and independent means mounted on said mem' her for selectively regulating the engagement of said operating means with said drive shaft.

3. In a typewriter, type levers, a rotating drive shaft, means connected with said type levers for operating the latter, means for bringing said operating means into engagement With said drive shaft for actuating said type levers, independently adjustable abutment members for said operating means for limiting the engage-ment of the latter with said drive shaft, and means for adjusting said abutment members in com mon. 1

4. In a typewriter. type levers. a rotatin; drive shaft, means connected with said type levers for operating'the latter, means for bringing said operating means into engagement WltltSflld drive shaft for actuating said type levers, independently rotatable abutment cams for limiting the engagement of said operating means with said drive shaft, means for locking said cams in selective positions, a common mounting shaft for said cams, and means for moving said mounting shaft for adjusting said cams in common.

5. In a typewriter, a key lever, a type lever, a rotating drive shaft, an operating member linked to said type lever, means on said operating member for engaging said shaft on the actuation of said key lever, an abutment for limiting the engagei ment of said operating member with said shaft, a lever, and means whereby on the actuation of said lever said abutment is displaced, for the purpose described.

6. In a typewriter, a key lever, a type lever, a rotating drive shaft, an operating member connected to said type lever, means on said operating member for engaging said shaft upon the actuation of said key lever, an abutment for limiting the engagementof said operating member with said shaft, a pivotal support for said abutment, a cam surface, means in connection with said abutl'nent engaging said cam surface, and means for displacing said cam surface for adjusting the position of said abutment.

7. In a typewriter, key levers, type levers, a rotating drive shaft,- operating members connected to said type levers, said operating members being adapted to engage said shaft upon the actuation of said key levers,

an.abutment member common to all of said operating members for limiting their engagement with said shaft, a lever, and means interposed between one end of said 1 lever and said abutment member whereby on a movement of said lever saidabutment member is displaced relative to all of said operating members for adjusting the striking force of all the latter equally and in common.

8. In a typewriter, a rotatin cam element, key levers, type levers, pu l hooks in connection with said type levers, whereby on the depression of a key lever an associated pull hook is brought within the influence of said cam element for actuating a respective type lever, means for determining the movement of single pull hooks, and means ment elements for determining the movement of said pull hook, said abutment elements consisting of pivoted cams, and means for locking said cams in desired position.

10. In a type-writer, a rotating cam element, a key lever, a type lever, a pull hook in connection with said type lever, means whereby on the depression of said key lever said pull hook is brought \vithinthe influence of said cam element for actuating said type lever. an adjustable abutn'ient means for deteru'iining the movement of said pull hook, said abutment means con'iprising a pivoted cam, a disk in rigid connection with said cam, said disk being provided with apertures arranged on an arc concentric with the pivotal point of said cam, and a pin selectively inscrtabie in said apertures for locking said cam. i

ll. In a typewriter, a rotating cam element, key levers, type levers, pull hooks in connection with said type levers, means whereby on the depression of a key lever an associated pull hook is brought within the influence of said cam element for actuating a respective type lever, and independent abutment means for determining the move- 'ment of said pull hooks, comprising pivoted cams coaxially arranged, disks in rigid connection with said cams, said disks being provided with apertures arranged on an arc concentric with the axis of said cams, and pins insertable in said apertures from opposite directions for locking said cams.

12. Structure according to claim 11 wherein the pins are inserted substantially parallelly in different. sets of aligned apertures.

13. In a t 'pewriter, a rotating cam element, key levers, type levers, operating members, mcanswiereby on the depression of a key lever an associated operating member is brought within the influence of said cam element for actuating a respective type lever, independently adjustable abutment means for determining the movement of said operating members, a pivoted frame for supporting said abutment means, and means for moving said frame about its pivot points Whereby said abutment means are adapted to be adjusted in common.

14. In a typewriter, a type lever, a key lever, a rotating drive shaft, an operating I s a a member in connection with said type lever, a

lever, a pull hook in connection with said type lever, a latch member forming a coupling element between said key lever and said pull hook, said latch member having a slot therein, said key lever having a pin projecting in saidv slot, and a spring interposed between said latch member and said key lever, whereby saidlatch member is adapted to be impositively influenced upon the depression of said key lever.

16. In a typewriter, a type lever, a rotating drive shaft, an operating member 1n connection with said type lever, a latch member engaging said operating member, means for displacing said latch member whereby said operating member is brought into en- 'agement with said drive shaft, and means for locking said latch member in dlsplaced position. a

17. In a typewriter, type levers, a rotat ng drive shaft, operating members in connection with said type levers, latch members engaging said operating members, means for displacing a latch member whereby its associated operating member 1s brought mto engagement with said drive shaft, means for locking said latch member in displaced position, and means controlled by sa1d displaced latch member for preventing the displacement of another latch member. a

18. In a typewriter, a key lever, B. type lever, a pull hook in connection with said type lever, a rotating drive shaft, a latch member mounted on. *said key lever and engaging said pull hook, a locking bar, means on said latch member for engaging sa1d locking bar upon the de ression of said key lever, and means on sa1d pull hook for engagin .saiddrive shaft upon the depression of sa1d key lever.

, 19. In a typewriter, key levers, type levers, pull hooks in connection with said type levers, a rotating drive shaft, latch members mounted on said ke said pull hooks, a 100 'ng bar, means on said latch members for engaging said locking bar upon the depression of respective key levers, means on said pull hooks for engaging said drive shaft upon the depression of respective key levers, and means controlled by an actuated latch member for preventing the actuation of another latch member.

20. In a typewriter, a key lever, a type lever, a pull hook in connection with said type lever, a rotating drive shaft, a latch member mounted on said key lever and engagi said pull hook, a locking rail beneath sai pull hook, hookmeans on said latch member positioned opposite said locking rail upon the actuation of said key lever, means adapted to rock said latch member and thereby en-' levers and engaging gage said hook means with said locking rail, and means on said pull hook for engaging said drive shaft upon the depression of said key lever.

21. In a typewriter, a type lever, a key lever, a rotating drive shaft, an operating member connected to said type lever, a latch member. engaging said pull hook, a lostmotion connection between said latch memher and said key lever, a locking rail, and means on said latch member whereby upon the actuation of said key lever said latch member engages said locking rail without retaining said key lever in displaced position.

22. In a typewriter, a type lever, a key lemember in connection with said type lever,

. a latch member pivoted to said key lever and engaging said operating member, whereby upon the actuation of said key lever said latch member is displaced and said-operating means is thereby brought into engagement with said shaft for actuating said type lever, a keeper engaged by said latch mem ber in its displaced position, and means for releasing said latch member from said keeper subsequent to the typing stroke of said type lever. 23.- In a typewriter, a type lever, a key lever, a rotating drive shaft, an operating member in connection with saidtype lever, a latch member pivotedto said key lever, and engaging said operating member, whereby upon. the actuation of said key lever said latch member is displaced and said operat ing means is thereby brought into engagement with said shaft for actuating said type lever, a keeper engaged by said latch member in its displaced position, and means on sa1d oppratingmeans for releasing said latch mem er from said keeper subsequent to y the typing stroke of said type lever. 24. In a typewriter, a type lever, a rotatmg drive s aft, an operating member in connection with said type lever, means for ill) adjusting the normalposition of said operday of June, 1923.

' CARL SGHLIINS.

oing specification signed at Ber- 

